fix(@angular/build): cleanup karma temporary directory after process exit

[clydin]

The temporary directory created for the karma builder will now be cleaned up after the process exits.

(cherry picked from commit 1c2d49e)

[PowerKiKi]

@clydin, AFAIK this PR has been released in @angular/cli 20.3.5, and yet I still see left-over dist/test-out after running tests.

It is easy to reproduce with the one-liner below. Shall I open a new bug ? or are you able to shine some light on this situation ?

ng new my-app --interactive=false && cd my-app && ng test --watch=false && ls dist && ng version

Output:

CREATE my-app/README.md (1468 bytes)
CREATE my-app/.editorconfig (314 bytes)
CREATE my-app/.gitignore (604 bytes)
CREATE my-app/angular.json (2396 bytes)
CREATE my-app/package.json (1129 bytes)
CREATE my-app/tsconfig.json (992 bytes)
CREATE my-app/tsconfig.app.json (429 bytes)
CREATE my-app/tsconfig.spec.json (408 bytes)
CREATE my-app/.vscode/extensions.json (130 bytes)
CREATE my-app/.vscode/launch.json (470 bytes)
CREATE my-app/.vscode/tasks.json (938 bytes)
CREATE my-app/src/main.ts (222 bytes)
CREATE my-app/src/index.html (291 bytes)
CREATE my-app/src/styles.css (80 bytes)
CREATE my-app/src/app/app.css (0 bytes)
CREATE my-app/src/app/app.spec.ts (664 bytes)
CREATE my-app/src/app/app.ts (288 bytes)
CREATE my-app/src/app/app.html (20122 bytes)
CREATE my-app/src/app/app.config.ts (400 bytes)
CREATE my-app/src/app/app.routes.ts (77 bytes)
CREATE my-app/public/favicon.ico (15086 bytes)
✔ Packages installed successfully.
    Successfully initialized git.
Initial chunk files  | Names             |  Raw size
chunk-G3UOG67Z.js    | -                 |   2.50 MB | 
polyfills.js         | polyfills         |   1.03 MB | 
spec-app-app.spec.js | spec-app-app.spec | 229.96 kB | 
jasmine-cleanup-1.js | jasmine-cleanup-1 |  67.20 kB | 
test_main.js         | test_main         |  21.77 kB | 
chunk-TTULUY32.js    | -                 |   1.99 kB | 
jasmine-cleanup-0.js | jasmine-cleanup-0 | 519 bytes | 
styles.css           | styles            |  95 bytes | 

                     | Initial total     |   3.85 MB

Application bundle generation complete. [1.985 seconds] - 2025-10-10T10:11:48.456Z

10 10 2025 19:11:48.566:INFO [karma-server]: Karma v6.4.4 server started at http://localhost:9876/
10 10 2025 19:11:48.567:INFO [launcher]: Launching browsers Chrome with concurrency unlimited
10 10 2025 19:11:48.571:INFO [launcher]: Starting browser Chrome
10 10 2025 19:11:54.031:INFO [Chrome 141.0.0.0 (Linux 0.0.0)]: Connected on socket ndtEbk4-L86pqyLNAAAB with id 68524871
Chrome 141.0.0.0 (Linux 0.0.0): Executed 2 of 2 SUCCESS (0.12 secs / 0.107 secs)
TOTAL: 2 SUCCESS
test-out         ⚠️⚠️⚠️ the directory still exists ⚠️⚠️⚠️

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    


Angular CLI: 20.3.5
Node: 22.20.0
Package Manager: yarn 1.22.22
OS: linux x64
    

Angular: 20.3.4
... common, compiler, compiler-cli, core, forms
... platform-browser, router

Package                      Version
------------------------------------
@angular-devkit/architect    0.2003.5
@angular-devkit/core         20.3.5
@angular-devkit/schematics   20.3.5
@angular/build               20.3.5
@angular/cli                 20.3.5   ⚠️⚠️⚠️ the version is the latest ⚠️⚠️⚠️
@schematics/angular          20.3.5
rxjs                         7.8.2
typescript                   5.9.3
zone.js                      0.15.1